Patents by Inventor Kazunori Mano

Kazunori Mano has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7580834
    Abstract: At the speech encoding end, upon generation of an fixed excitation vector, the shape of an excitation vector output from pulse excitation codebook 301 is identified in pulse excitation vector shape identifier 302, a dispersion vector used for excitation vectors of the shape is output from dispersion vector storage 304, and, in dispersion vector convolution processor 303, dispersion vector convolution processing of the excitation vector is performed. In particular, when a pulse excitation vector having a specific shape of high frequency of use is output from pulse excitation codebook 301, pulse excitation vector shape identifier 302 controls dispersion vector storage 304 in such a way that an additional dispersion vector prepared dedicated to the pulse excitation vector is output. By this means, it is possible to provide a technology that improves the quality of decoded speech and that decodes speech more natural and audible to the user.
    Type: Grant
    Filed: February 20, 2003
    Date of Patent: August 25, 2009
    Assignees: Panasonic Corporation, Nippon Telegraph and Telephone Corporation
    Inventors: Hiroyuki Ehara, Kazutoshi Yasunaga, Kazunori Mano, Yusuke Hiwasaki
  • Patent number: 7478042
    Abstract: A first determiner 121 tentatively determines whether the current processing unit represents a stationary noise period, based on stationary properties of a decoded signal. Based on the tentative determination result and a determination result of the periodicity of the decoded signal, a second determiner 124 determines whether the current processing unit represents a stationary noise period, thereby distinguishing a decoded signal including a stationary speech signal such as a stationary vowel from stationary noise and correctly identifying the stationary noise period.
    Type: Grant
    Filed: November 30, 2001
    Date of Patent: January 13, 2009
    Assignee: Panasonic Corporation
    Inventors: Hiroyuki Ehara, Kazutoshi Yasunaga, Kazunori Mano, Yusuke Hiwasaki
  • Patent number: 7392179
    Abstract: The present invention carries out pre-selection on many LPC codevectors stored in an LSF codebook 101 using a weighted Euclidean distortion as a measure and carries out a full-code selection on the LPC codevectors left after the pre-selection using an amount of distortion in a spectral space as a measure. This makes it possible to improve the quantization performance of the LPC parameter vector quantizer and improve the quality of synthesized speech of the speech coder/decoder.
    Type: Grant
    Filed: November 29, 2001
    Date of Patent: June 24, 2008
    Assignees: Matsushita Electric Industrial Co., Ltd., Nippon Telegraph and Telephone Corporation
    Inventors: Kazutoshi Yasunaga, Toshiyuki Morii, Hiroyuki Ehara, Kazunori Mano, Yusuke Hiwasaki
  • Patent number: 7065338
    Abstract: In coding and decoding an acoustic parameter, a weighted vector is generated by multiplying a code vector output in a past frame and a code vector selected in a present frame by weighting factors respectively selected from a factor code book and adding the products to each other.
    Type: Grant
    Filed: November 27, 2001
    Date of Patent: June 20, 2006
    Assignees: Nippon Telegraph and Telephone Corporation, Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazunori Mano, Yusuke Hiwasaki, Hiroyuki Ehara, Kazutoshi Yasunaga
  • Publication number: 20050228652
    Abstract: At the speech encoding end, upon generation of an fixed excitation vector, the shape of an excitation vector output from pulse excitation codebook 301 is identified in pulse excitation vector shape identifier 302, a dispersion vector used for excitation vectors of the shape is output from dispersion vector storage 304, and, in dispersion vector convolution processor 303, dispersion vector convolution processing of the excitation vector is performed. In particular, when a pulse excitation vector having a specific shape of high frequency of use is output from pulse excitation codebook 301, pulse excitation vector shape identifier 302 controls dispersion vector storage 304 in such a way that an additional dispersion vector prepared dedicated to the pulse excitation vector is output. By this means, it is possible to provide a technology that improves the quality of decoded speech and that decodes speech more natural and audible to the user.
    Type: Application
    Filed: February 20, 2003
    Publication date: October 13, 2005
    Applicants: Matsushita Electric Industrial Co., Ltd., Nippon Telegraph and Telephone Corporation
    Inventors: Hiroyuki Ehara, Kazutoshi Yasunaga, Kazunori Mano, Yusuke Hiwasaki
  • Patent number: 6810381
    Abstract: In the CELP coding system a low-order synthesis filter and a cascade-connected synthesis filter formed by a cascade connection of low- and high-order synthesis filters are provided, a synthesized acoustic signal is estimated in a mode decision part for an input acoustic signal, and the estimated synthesized acoustic signal is subjected to inverse filtering by an inverse filter corresponding to the low-order synthesis filter and an inverse filter corresponding to the cascade-connected synthesis filter to obtain residual signals. That one of the synthesis filters which corresponds to the residual signal of smaller power is selected by a switch, and a codebook is searched for indices which will minimize the error between the output synthesized acoustic signal by the selected synthesis filter and the input acoustic signal.
    Type: Grant
    Filed: May 11, 2000
    Date of Patent: October 26, 2004
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Shigeaki Sasaki, Kazunori Mano, Shinji Hayashi
  • Publication number: 20040049380
    Abstract: First determiner 121 provisionally determines whether a current processing unit is a stationary noise region based on a determination result on stationary characteristics of a decoded signal. Based on the provisional determination result and a determination result on periodicity of the decoded signal, second determiner 124 further determines whether the current processing unit is a stationary noise region, whereby a decoded signal including a stationary speech signal such as a stationary vowel is distinguished from a stationary noise, and thus the stationary noise region is detected accurately.
    Type: Application
    Filed: May 22, 2003
    Publication date: March 11, 2004
    Inventors: Hiroyuki Ehara, Kazutoshi Yasunaga, Kazunori Mano, Yusuke Hiwasaki
  • Publication number: 20040023677
    Abstract: In coding and decoding an acoustic parameter, a weighted vector is generated by multiplying a code vector output in a past frame and a code vector selected in a present frame by weighting factors respectively selected from a factor code book and adding the products to each other.
    Type: Application
    Filed: May 27, 2003
    Publication date: February 5, 2004
    Inventors: Kazunori Mano, Yusuke Hiwasaki, Hiroyuki Ehara, Kazutoshi Yasunaga
  • Publication number: 20040015346
    Abstract: The present invention carries out pre-selection on many LPC codevectors stored in an LSF codebook 101 using a weighted Euclidean distortion as a measure and carries out a full-code selection on the LPC codevectors left after the pre-selection using an amount of distortion in a spectral space as a measure. This makes it possible to improve the quantization performance of the LPC parameter vector quantizer and improve the quality of synthesized speech of the speech coder/decoder.
    Type: Application
    Filed: May 27, 2003
    Publication date: January 22, 2004
    Inventors: Kazutoshi Yasunaga, Toshiyuki Morii, Hiroyuki Ehara, Kazunori Mano, Yusuke Hiwasaki
  • Patent number: 5787391
    Abstract: In a speech coding method of the present invention, initially, a plurality of samples of speech data are analyzed by a linear prediction analysis and thereby prediction coefficients are calculated. Then, the prediction coefficients are quantized, and the quantized prediction coefficients are set in a synthesis filter. Moreover, a pitch period vector is selected from an adaptive codebook in which a plurality of pitch period vectors are stored, and the selected pitch period vector is multiplied by a first gain which is obtained, at the same time, with a second gain. In addition, a noise waveform vector is selected from a random codebook in which a plurality of the noise waveform vectors are stored, and is multiplied by a predicted gain and the second gain. Then, the speech vector is synthesized by exciting the synthesis filter with the pitch period vector multiplied by the first gain, and with the noise waveform vector multiplied by the predicted gain and the second gain.
    Type: Grant
    Filed: June 5, 1996
    Date of Patent: July 28, 1998
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Takehiro Moriya, Akitoshi Kataoka, Kazunori Mano, Satoshi Miki, Hitoshi Omuro, Shinji Hayashi
  • Patent number: 5732188
    Abstract: In a CELP coding scheme, p-order LPC coefficients of an input signal are transformed into n-order LPC cepctrum coefficients c.sub.j (S.sub.2), which are modified into n-order modified LPC cepstrum coefficients c.sub.j ' (S.sub.3). Log power spectral envelopes of the input signal and a masking function suited thereto are calculated (FIGS. 3B, C), then they are subjected to inverse Fourier transform to obtain n-order LPC cepstrum coefficients, respectively, (FIGS. 3D, E), then the relationship between corresponding orders of the LPC cepstrum coefficients is calculated, and the modification in step S.sub.3 is carried out on the basis of the relationship. The modified coefficients c.sub.j are inversely transformed by the method of least squares into m-order LPC coefficients for use as filter coefficients of a perceptual weighting filter. This concept is applicable to a postfilter as well.
    Type: Grant
    Filed: March 11, 1996
    Date of Patent: March 24, 1998
    Assignee: Nippon Telegraph and Telephone Corp.
    Inventors: Takehiro Moriya, Kazunori Mano, Satoshi Miki, Hitoshi Ohmura, Shigeaki Sasaki, Naoki Iwakami
  • Patent number: 5396576
    Abstract: An excitation vector of the previous frame stored in an adaptive codebook is cut out with a selected pitch period. The excitation vector thus cut out is repeated until one frame is formed, by which a periodic component codevector is generated. An optimum pitch period is searched for so that distortion of a reconstructed speech obtained by exciting a linear predictive synthesis filter with the periodic component codevector is minimized. Thereafter, a random codevector selected from a random codebook is cut out with the optimum pitch period and is repeated until one frame is formed, by which a repetitious random codevector is generated. The random codebook is searched for a random codevector which minimizes the distortion of the reconstructed speech which is provided by exciting the synthesis filter with the repetitious random codevector.
    Type: Grant
    Filed: May 20, 1992
    Date of Patent: March 7, 1995
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Satoshi Miki, Takehiro Moriya, Kazunori Mano, Hitoshi Ohmuro, Hirohito Suda
  • Patent number: D264081
    Type: Grant
    Filed: May 29, 1980
    Date of Patent: April 27, 1982
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Isao Sekita, Kiyoshi Suzuki, Kazuyoshi Sugisaki, Kenichi Ito, Masaki Yamamoto, Kazunori Mano
  • Patent number: D281161
    Type: Grant
    Filed: June 6, 1983
    Date of Patent: October 29, 1985
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Toyoyuki Uematsu, Yoshiaki Kawata, Kazunori Mano, Hiroyuki Tsubaki
  • Patent number: D282468
    Type: Grant
    Filed: June 14, 1983
    Date of Patent: February 4, 1986
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Toyoyuki Uematsu, Yoshiaki Kawata, Kazunori Mano
  • Patent number: D290007
    Type: Grant
    Filed: September 10, 1984
    Date of Patent: May 26, 1987
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazunori Mano, Yoshiaki Kawata, Yutaka Itoh
  • Patent number: D300598
    Type: Grant
    Filed: March 4, 1986
    Date of Patent: April 11, 1989
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshiaki Ueda, Hiroshi Toyoda, Kazunori Mano, Toshiaki Tsuruha, Akinobu Kanza
  • Patent number: D382766
    Type: Grant
    Filed: June 13, 1996
    Date of Patent: August 26, 1997
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masanori Hamada, Kazunori Mano, Hisashi Yoshida
  • Patent number: D856742
    Type: Grant
    Filed: May 4, 2018
    Date of Patent: August 20, 2019
    Assignee: IRIS OHYAMA INC.
    Inventor: Kazunori Mano
  • Patent number: D856743
    Type: Grant
    Filed: May 8, 2018
    Date of Patent: August 20, 2019
    Assignee: IRIS OHYAMA INC.
    Inventor: Kazunori Mano